CN102699028A - Method for eliminating linear edge defects of hot-rolled low-carbon steel - Google Patents
Method for eliminating linear edge defects of hot-rolled low-carbon steel Download PDFInfo
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- CN102699028A CN102699028A CN2012100444709A CN201210044470A CN102699028A CN 102699028 A CN102699028 A CN 102699028A CN 2012100444709 A CN2012100444709 A CN 2012100444709A CN 201210044470 A CN201210044470 A CN 201210044470A CN 102699028 A CN102699028 A CN 102699028A
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Abstract
Disclosed is a method for eliminating linear edge defects of hot-rolled low-carbon steel. The method is characterized by comprising following technological processes: step one, heating continuous casting billet; step two, descaling with high-pressure water; step three, using a sizing press for width adjustment; step four, roughly rolling; step five, preserving heat with a thermal insulation cover; step six, heating edges; step seven, cutting heads and tails with a flying shear; step eight, performing finish rolling for descaling; step nine, performing finish rolling; step ten, performing laminar cooling; and step eleven, reeling. The method is further characterized in that a place equal to the continuous casting billet in size is reserved between the continuous casting billet and a furnace outlet when heating the continuous-cast billet at the step one is performed. According to the method for eliminating the linear edge defects of the hot-rolled low-carbon steel, the linear edge defects of the hot-roller low-carbon steel can be eliminated only by adjusting process parameters while modification of production line equipment is not needed, and coexistence region rolling is avoided, so that mixed grain of hot-rolled strip steel is avoided.
Description
Technical field
The invention belongs to the hot rolling technical field, particularly, the present invention relates to the removing method of a kind of low-carbon hot-rolled steel limit portion line defect
Background technology
Therefore low-carbon hot-rolled steel is used widely in moulded products such as automobile, household electrical appliances and various instrument and meters because its excellent deep drawability can satisfy the requirement of various complicated moulded products.Simultaneously, this series products is also increasingly high to the requirement of plate surface quality, especially to the normal steel plate that adopts complete free of surface defects of vehicle exterior cladding element.Therefore, the various blemish that occur in the operation of rolling can have a strong impact on shaped article quality and economic benefit of enterprises.
A kind of limit portion line defect usually appears in the surface of low-carbon hot-rolled steel, and such defective is also usually claimed (Edge Seam Defect) such as limit portion crackle, limit portion black line, limit portion wire crackles.This defective mainly is distributed in the both sides of sheet material upper and lower surfaces or one-sided in limit portion certain distance, forms along steel plate to roll to the thin-line-shaped or strip of sheet that distributes, banded line defect.
Said limit portion line defect is different in size, and the order of severity differs, or long through whole roll bending, or comes across certain part on the strip edge minister degree direction.The coils of hot-rolled steel that such defective takes place is carrying out follow-uply when cold rolling, then can cause the surperficial relevant position of cold-reduced sheet spot to occur, and possibly bring to wipe to cold roll and scratch.Therefore, normally deliver goods, need before tissue is produced, increase hot rolled plate target finished width in order to guarantee product; Way through cutting edge is accomplished contract for goods; So not only bring very big difficulty to organization of production, lumber recovery obviously descends simultaneously, has directly influenced the competitiveness of product in market.
Through the microscopic observation of opposite side portion line defect and the high temperature deformation drag research of mild steel; Can confirm: the formation mechanism of such defective is in the operation of rolling; Uneven because of continuous casting billet width temperature, especially because continuous casting billet corners temperature is low excessively, get into two-phase section in this position of distortion later stage; Various piece distortion is inhomogeneous when causing rolling spreading, and corners is divided gauffer is taken place.Along with spreading in the flat rolling process carried out, continuous casting billet corners upset gets into upper and lower surfaces, and constantly moves to continuous casting billet width center, finally in that portion's certain distance zone forms along rolling to the said line defect that distributes apart from the limit.
Solve such defective at present different ways is arranged.
For example; Application number is the Chinese utility model patent of " 200720067413.7 "; Disclose a kind of continuous cast mold, its technical scheme system is set to circular arc through crystallizer minor face plate madial wall, and four angles of crystallizer are set to fillet; Hope makes the continuous casting billet cross section after the casting be cydariform, and four corner angle are fillet.Continuous casting billet after the casting has been avoided the too fast cooling of corner part effectively in course of hot rolling like this, and the end face of long side plate can evenly cool off slowly, makes 1～2 centimeter place of limit portion roll the longitudinal strip black line defective elimination that the back produces.This way is because bigger scrap build, and to the influence of continuous casting process, the enterprise that adopts this method to transform at present is also few.
And for example; Application number is applied for a patent for " a kind of eliminate the method that skin is stuck up in IF steel limit portion in the hot continuous rolling process " China of " 201010237117.3 "; Adopt the thermal modeling test method to measure the phase transition temperature of IF steel in course of hot rolling; Control, suitably improve the temperature of steel tapping side through the heating furnace pressure-fired, adjust rolling and de-scaling sequential, the contrary spray of the cleaning utilization of roughing and finish rolling de-scaling water replaces the side spray, avoids strip edge portion to receive washing away of water; As a control target, the skin defective is stuck up in the limit portion that solves the IF steel with the finish rolling inlet temperature.
For another example; Application number is that " 200810234287.9 ", denomination of invention are applied for a patent for China's invention of " a kind of edger roll roll design of improving hot-strip limit portion impression defective (Slab Edge) ", discloses a kind of edger roll roll design of improving hot-strip limit portion impression defective.By having the plain-barreled roll that changing into of tapering has convexity, the size of its convexity is 150～200um to this technical scheme with the roll shape of edger roll, and the convexity partial design is from roll line 0～135mm place, convexity to play an angle angle be 3～5 °.According to this scheme; Its advantage is: utilize this roll design can bring into play edger roll the 3rd passage (Pass) continuous casting billet and nip thickness when being 135mm; Realize the width compression of edger roll, when realizing spreading control, dwindled the width of limit portion impression defective (Slab Edge) continuous casting billet both sides thickness direction mid portion; Improve the product casting yield, reduced production cost.When this method is effectively dwindled the defective width, can not eliminate this defective, and bring the problem of roughing rolling stability.
In addition, some documents are also arranged through improving the continuous casting billet tapping temperature, guarantee that the temperature of the operation of rolling does not get into two-phase section, this method possibly brought the problem of belt steel surface iron scale simultaneously.External developed a kind of new edger roll roll forming in April, 1989, i.e. double tapered angle roll forming (EFM), new roll forming can improve the distortion of continuous casting billet corners, through reducing variations in temperature and improve the fine crack defective, thereby alleviates the adverse effect to slit.Also have in addition through the vertical miller of band convexity and the SP side compression machine of band convexity, when side pressure, be pre-formed concave side edges, absolute spread and slit width when reducing flat rolling have been controlled the distance of limit portion line defect to strip edge portion effectively.Domestic once passing through optimized edger roll pass and side pressure technology, and edger roll is arranged to the roll forming with rounded corner, when roughing, the continuous casting billet corners is rolled into rounded corner, can reduce variations in temperature equally and improve the fine crack defective, effectively reduces the black line occurrence probability.
The disclosed method of comprehensive above-mentioned document, its main purpose concentrate on the distance of control edge fault, just do not eliminate limit portion line defect as yet and propose practicable method.
Summary of the invention
For overcoming the problems referred to above, main purpose of the present invention is: a kind of method of eliminating low-carbon hot-rolled steel limit portion line defect is provided, eliminates the method for low-carbon hot-rolled steel limit portion line defect according to the present invention; In course of hot rolling,, lower limit portion temperature drop through adjustment to technology; Prevent that continuous casting billet limit portion from getting into two-phase section, utilize existing equipment to eliminate low-carbon hot-rolled steel limit portion line defect, this method need not produced the transformation of line equipment; Method is simply suitable, and is workable, and effect is remarkable.
For satisfying above-mentioned specification requirement, the control removing method technical scheme of low-carbon hot-rolled steel of the present invention limit portion line defect is following:
The control removing method of a kind of low-carbon hot-rolled steel limit portion line defect, said method comprises following technological process:
Step 1: continuous casting billet heating → step 2: high-pressure water descaling → step 3: the Fixed width forcing press is transferred wide → step 4: roughing → step 5: stay-warm case insulation → step 6: limit portion heating → step 7: flying shear crop end → step 8: finish rolling de-scaling → step 9: finish rolling → step 10: laminar flow cooling → step 11: batch;
It is characterized in that; When steps performed one continuous casting billet heats; A vacant position with the identical size of continuous casting billet between continuous casting billet and plug for outlet, promptly the distance between continuous casting billet and the plug for outlet is the width of a continuous casting billet, directly is retracted on the furnace delivery table after the continuous casting billet soaking to be rolled.
A vacant purpose with the position of the identical size of continuous casting billet is: increase continuous casting billet and take out preceding the distance from fire door of steel, reduce to take out steel when door opened at every turn, exchange heat causes temperature reduction, the especially temperature drop of continuous casting billet corners of continuous casting billet inside and outside the stove.
Removing method according to a kind of low-carbon hot-rolled steel of the present invention limit portion line defect is characterized in that, is limited to 1220 ℃ under the continuous casting billet tapping temperature.
Removing method according to a kind of low-carbon hot-rolled steel of the present invention limit portion line defect is characterized in that, after continuous casting billet is come out of the stove, during through the step 2 high-pressure water descaling, only opens one section de-scaling water nozzle.
Removing method according to a kind of low-carbon hot-rolled steel of the present invention limit portion line defect is characterized in that, when continuous casting billet got into the step 5 roughing, the de-scaling water of roughing porch was closed, roughing port opening de-scaling water when the first passage roughing; The de-scaling water of follow-up roughing passage is closed.
The purpose of aforesaid operations is, guarantees that scale removal effect reduces temperature drop simultaneously as far as possible, and guarantee continuous casting billet after de-scaling for some time return temperature, guarantee that the corners and the center temperature difference are unlikely excessive.
Removing method according to a kind of low-carbon hot-rolled steel of the present invention limit portion line defect is characterized in that, after the step 5 roughing, the thickness of intermediate blank is more than the 45mm.
The thickness of intermediate blank is set to 45mm the above object, is for through improving intermediate blank thickness, reduces each passage time of roughing, reduces the temperature drop of roughing process.
Removing method according to a kind of low-carbon hot-rolled steel of the present invention limit portion line defect is characterized in that, before intermediate blank gets into mm finishing mill unit, utilizes strip edge heater to carry out the heating of limit portion, makes limit portion temperature improve 40-80 ℃.
Removing method according to a kind of low-carbon hot-rolled steel of the present invention limit portion line defect is characterized in that, cooling water and side water spray between control mm finishing mill unit frame guarantee that the temperature control of finish rolling outlet strip edge portion is not less than 920 ℃.
According to the removing method of a kind of low-carbon hot-rolled steel of the present invention limit portion line defect, compare the method for mentioning in existing patent and the document, its advantage is following:
(1) can eliminate low-carbon hot-rolled steel limit portion line defect, and be not only the distance of control limit portion line defect from strip edge portion;
(2) need not produce the line scrap build, only just can eliminate low-carbon hot-rolled steel limit portion line defect through the adjustment of technological parameter.
(3) owing to temperature drop in its whole operation of rolling is less, the limit portion finishing temperature that belt steel temperature is minimum all is controlled at more than the phase transition temperature, has avoided the coexistence region rolling, has therefore avoided the generation of hot-strip mixed crystal phenomenon.
Description of drawings
Fig. 1 technological process of production figure of the present invention.
Fig. 2 takes out steel change in location sketch map.
Wherein 1 is heating furnace, and 2 is continuous casting billet, and A is the heating location of continuous casting billet, and B is a rest position.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described further.
According to method of the present invention, 3 kinds of mild steel are rolled, according to the steel grades difference, be expressed as: A1, A2, A3.
Continuous casting billet carries out high-pressure water descaling through after the heating, in two sections water nozzles of high-pressure water descaling case, only opens one section de-scaling water nozzle near arrival end, closes the de-scaling water nozzle of the port of export.
Wide through the wide side compression machine accent of toning afterwards, carry out 2 frame roughing again, roughing adopts the 1-5 passage rolling, rolling 1 road of R1, rolling 5 roads of R2 carry out de-scaling in the R1 outlet, and other passage de-scaling water is closed.
Thus, because of continuous casting billet before rolling in the short time not but by the de-scaling water-cooled, have the enough time to return temperature, guarantee that corners and middle portion temperature difference are little.Simultaneously, the intermediate blank thickness setting is 48mm, reduces the roughing time, reduces the roughing temperature losses of the process.
Get into delay table after the roughing, delay table heats up 80 ℃ to intermediate blank limit portion through strip edge heater through the stay-warm case insulation again, and crop end gets into mm finishing mill unit afterwards.
The finish rolling outlet temperature is 940-950 ℃, afterwards through batching rolling after the laminar flow cooling.
Produced 157 volume mild steel as stated above, followed the tracks of and the uncoiling hand inspection, in the test volume, do not found limit portion line defect through online surface quality.
Table 1 is a main technique setup parameter among the embodiment.
Table 1
Eliminate the method for low-carbon hot-rolled steel limit portion line defect according to the present invention, in course of hot rolling, through adjustment to technology; Lower limit portion temperature drop, prevent that continuous casting billet limit portion from getting into two-phase section, utilize existing equipment to eliminate low-carbon hot-rolled steel limit portion line defect; This method need not produced the transformation of line equipment; Method is simply suitable, and is workable, and effect is remarkable.
Claims (7)
1. the control removing method of a low-carbon hot-rolled steel limit portion line defect, said method comprises following technological process:
Step 1: continuous casting billet heating → step 2: high-pressure water descaling → step 3: the Fixed width forcing press is transferred wide → step 4: roughing → step 5: stay-warm case insulation → step 6: limit portion heating → step 7: flying shear crop end → step 8: finish rolling de-scaling → step 9: finish rolling → step 10: laminar flow cooling → step 11: batch
It is characterized in that: when steps performed one continuous casting billet heats; A vacant position with the identical size of continuous casting billet between continuous casting billet and plug for outlet; Be that distance between continuous casting billet and the plug for outlet is the width of a continuous casting billet, directly be retracted on the furnace delivery table after the continuous casting billet soaking and be rolled.
2. the removing method of a kind of low-carbon hot-rolled steel according to claim 1 limit portion line defect is characterized in that, is limited to 1220 ℃ under the continuous casting billet tapping temperature.
3. the removing method of a kind of low-carbon hot-rolled steel according to claim 1 limit portion line defect is characterized in that, after continuous casting billet is come out of the stove, during through the step 2 high-pressure water descaling, only opens one section de-scaling water nozzle.
4. the removing method of a kind of low-carbon hot-rolled steel according to claim 1 limit portion line defect is characterized in that, when continuous casting billet got into the step 5 roughing, the de-scaling water of roughing porch was closed, roughing port opening de-scaling water when the first passage roughing; The de-scaling water of follow-up roughing passage is closed.
5. the removing method of a kind of low-carbon hot-rolled steel according to claim 1 limit portion line defect is characterized in that, after the step 5 roughing, the thickness of intermediate blank is more than the 45mm.
6. the removing method of a kind of low-carbon hot-rolled steel according to claim 1 limit portion line defect is characterized in that, before intermediate blank gets into mm finishing mill unit, utilizes strip edge heater to carry out the heating of limit portion, makes limit portion temperature improve 40-80 ℃.
7. the removing method of a kind of low-carbon hot-rolled steel according to claim 1 limit portion line defect is characterized in that, cooling water and side water spray between control mm finishing mill unit frame guarantee that the temperature control of finish rolling outlet strip edge portion is not less than 920 ℃.
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| CN201210044470.9A CN102699028B (en) | 2012-02-24 | 2012-02-24 | Method for eliminating linear edge defects of hot-rolled low-carbon steel |
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| CN201210044470.9A CN102699028B (en) | 2012-02-24 | 2012-02-24 | Method for eliminating linear edge defects of hot-rolled low-carbon steel |
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| CN103240276A (en) * | 2013-05-21 | 2013-08-14 | 山西太钢不锈钢股份有限公司 | Method for protecting edge heaters during hot rolling of stainless steel |
| CN103722015A (en) * | 2013-12-31 | 2014-04-16 | 一重集团大连设计研究院有限公司 | On-line width adjusting device of hot rolled strip steel production line |
| CN103862248A (en) * | 2014-03-19 | 2014-06-18 | 德龙钢铁有限公司 | Method for effectively preventing generation of head and tail surface defects in hot rolling process |
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